/*
This file is part of IRCaBot.
IRCaBot is IRC logger with features.
Source code: https://notabug.org/acetone/ircabot.
Copyright (C) acetone, 2023.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include "dataparser.h"

#include <QRegularExpression>

namespace parser {

QString get(const QString &string, const QString &key, GetType type)
{
    if (key.isEmpty())
    {
        return QString();
    }

    if (type == GetType::HttpHeader)
    {
        if (string.indexOf(QRegularExpression(key + ":")) == -1)
        {
            return QString();
        }
    }
    else if (string.indexOf(QRegularExpression(key + "\\s*=")) == -1)
    {
        return QString();
    }

    QString result {string};
    if (type == GetType::HttpHeader)
    {
        result.remove(QRegularExpression("^.*"+key+":\\s", QRegularExpression::DotMatchesEverythingOption));
    }
    else
    {
        result.remove(QRegularExpression("^.*"+key+"\\s*=", QRegularExpression::DotMatchesEverythingOption));
    }

    QString separator {' '};
    if (type == GetType::Url)
    {
        separator = '&';
    }
    else if (type == GetType::HttpHeader)
    {
        separator = "\r\n";
    }

    int valueEnd = result.indexOf(separator);

    if (valueEnd == -1 and type == GetType::Url)
    {
        separator = ' ';
        valueEnd = result.indexOf(separator);
        if (valueEnd != -1)
        {
            result.remove(valueEnd, result.size()-valueEnd);
        }
    }
    else if (valueEnd != -1)
    {
        result.remove(valueEnd, result.size()-valueEnd);
    }

    if (type == GetType::Url)
    {
        result = QByteArray::fromPercentEncoding(result.toUtf8());
        result.replace('+', ' ');
    }
    else if (type == GetType::HttpHeader)
    {
        result.remove('\"');
    }
    else
    {
        static QRegularExpression beginSpaces("^\\s*");
        static QRegularExpression endSpaces("\\s*$");
        result.remove(beginSpaces);
        result.remove(endSpaces);
    }

    return result;
}

} // namespace
